export default function showtime() {
  let dom = document.getElementById("showtime");
  var today, hour, second, minute, year, month, date;
  var strDate;
  today = new Date();
  // console.log("today---", today);
  var n_day = today.getDay();
  switch (n_day) {
    case 0:
      {
        strDate = "星期日";
      }
      break;
    case 1:
      {
        strDate = "星期一";
      }
      break;
    case 2:
      {
        strDate = "星期二";
      }
      break;
    case 3:
      {
        strDate = "星期三";
      }
      break;
    case 4:
      {
        strDate = "星期四";
      }
      break;
    case 5:
      {
        strDate = "星期五";
      }
      break;
    case 6:
      {
        strDate = "星期六";
      }
      break;
    case 7:
      {
        strDate = "星期日";
      }
      break;
  }
  year = today.getFullYear();
  // console.log('year--', year)
  month = today.getMonth() + 1;
  date = today.getDate();
  hour = today.getHours();
  minute = today.getMinutes();
  second = today.getSeconds();
  if (month < 10) month = "0" + month;
  if (date < 10) date = "0" + date;
  if (hour < 10) hour = "0" + hour;
  if (minute < 10) minute = "0" + minute;
  if (second < 10) second = "0" + second;
  dom
    ? (dom.innerHTML =
        year +
        "年" +
        month +
        "月" +
        date +
        "日 " +
        strDate +
        " " +
        hour +
        ":" +
        minute +
        ":" +
        second)
    : ""; // 显示时间
  return dom;
  // return setInterval('showtime();', 1000) // 设定函数自动执行时间为 1000 ms(1 s)
}
